import java.util.Scanner;

public class Main {
    //排序
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        String str=sc.nextLine();
        char[] arr=new char[str.length()];
        int i=0;
        int j=0;
        for(i=0;i<str.length();i++){
            arr[i]=str.charAt(i);
        }
        for(i=0;i<str.length()-1;i++){
            char min;
            for(j=0;j<str.length();j++){
                if(arr[j+1]<arr[j]){
                    min=arr[j+1];
                    arr[j+1]=arr[j];
                    arr[j]=min;
                }
            }
        }
        for(i=0;i<arr.length;i++){
            System.out.println(arr[i]+" ");
        }
    }
}